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- About mateja.jovanovic
mateja.jovanovi
Beginner
Network Architect, CCIE, VCIX-NV, Cisco ACI FE, Virtualization and SDN Enthusiast, Snowboarder, Ice hockey player
Biography from communities:
Cloud Architect, focused on SDN/NFV, Network Virtualization, Hybrid Cloud and Data Center Automation. MSc in IT, Cisco CCIE #45370 and VMware Network Virtualization Expert (VCIX-NV), with deep knowledge and over 10 years of experience in Networking and Security, mostly in Data Center environment.
Fluent in English, Spanish and Serbo-Croatian.
Blogging about Networking, SDN and Cloud since 2010: www.matscloud.com
Expert in: LAN/WAN and DC Network architecture, Network Virtualization and Security.
Focused on:
- SDN and Network Virtualization solutions such as Cisco ACI, VMware NSX, Nokia Nuage and Open source SDN Solutions such as OpenDayLight and Open Contrail.
- Private/Hybrid Cloud Solutions and their Integration with the SDN solutions and the physical and virtual network.
- Micro Services, and Application Evolution towards Containers.
Expertise:
SDN, Hybrid Cloud, IoT
Network Architect, CCIE, VCIX-NV, Cisco ACI FE, Virtualization and SDN Enthusiast, Snowboarder, Ice hockey player
Biography from communities:
Cloud Architect, focused on SDN/NFV, Network Virtualization, Hybrid Cloud and Data Center Automation. MSc in IT, Cisco CCIE #45370 and VMware Network Virtualization Expert (VCIX-NV), with deep knowledge and over 10 years
Recent Badges
Stats
Member since
12-05-2012
44
Posts
15
Helpful
2
Solutions
Created by
mateja.jovanovi
in Cloud Blogs
12-02-2017
01:52 AM
12-02-2017
01:52 AM
This looks really good, have you maybe tested it with Newton and Unified Plugin? I'd like to try it with UCS-B VLAN mode... @SNArchsCOM
... View more
Created by
mateja.jovanovi
in Application Centric Infrastructure
06-13-2017
01:51 AM
06-13-2017
01:51 AM
If you´re doing an upgrade just for the sake of it - I think it might be better to wait for the 3.0, I had a sneak peak, and its finally looking decent.
On the other side, if you need new features, like AppStore on ACI or similar, you can upgrade, we´ve had 2.2 for a while, and its pretty stable.
... View more
Created by
mateja.jovanovi
in Automation and Analytics
08-24-2016
01:47 AM
08-24-2016
01:47 AM
Ok, so I had this defined before, and I got a new Mac, and now I cant remember how exactly I did it... basically what happens now when I enter the SAMPLES and try to run any of the .py, I get: MatBook-Pro:samples mjovanovic$ python tutorial.py Traceback (most recent call last): File "tutorial.py", line 30, in <module> from acitoolkit.acitoolkit import * File "/Users/mjovanovic/acitoolkit/acitoolkit/__init__.py", line 31, in <module> from .acisession import EventHandler, Login, Session, Subscriber # noqa File "/Users/mjovanovic/acitoolkit/acitoolkit/acisession.py", line 46, in <module> from six.moves.queue import Queue ImportError: No module named queue MatBook-Pro:samples mjovanovic$ PS. I have credentials.py in all the required folders.
... View more
- Tags:
- pythonpath
Labels:
Created by
mateja.jovanovi
in Other Data Center Subjects
12-17-2015
06:08 AM
12-17-2015
06:08 AM
You´re the man. Two things to have in mind here:
1. Specify the correct speed using the "speed" command
2. Make sure the SFP is Cisco:
Nexus-5548-Geo2# show interface e1/11 transceiver detail Ethernet1/11 transceiver is present type is 10Gbase-SR name is CISCO-FINISAR part number is FTLX8571D3XXX-XX revision is A serial number is FNS17230WSF nominal bitrate is 10300 MBit/sec Link length supported for 50/125um OM2 fiber is 82 m Link length supported for 50/125um OM3 fiber is 300 m Link length supported for 62.5/125um fiber is 26 m cisco id is -- cisco extended id number is 4
SFP Detail Diagnostics Information (internal calibration) ---------------------------------------------------------------------------- Current Alarms Warnings Measurement High Low High Low ---------------------------------------------------------------------------- Temperature 49.75 C 75.00 C -5.00 C 70.00 C 0.00 C Voltage 3.20 V 3.63 V 2.97 V 3.46 V 3.13 V Current 8.48 mA 11.80 mA 4.00 mA 10.80 mA 5.00 mA Tx Power -1.88 dBm 1.69 dBm -11.30 dBm -1.30 dBm -7.30 dBm Rx Power N/A -- 1.99 dBm -13.97 dBm -1.00 dBm -9.91 dBm ---------------------------------------------------------------------------- Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
... View more
10-06-2015
01:50 AM
Well this is dissapointing... noone anwered in 6 months, and I have the exactly same problem...
... View more
07-16-2015
09:21 AM
You probably managed to solve this, or gave up, but when the Port goes to a SUSPENDED state (s) - there is a difference in the physical or config layer, something like speed and/or duplex, so make sure that on "show interface" on all Port-channel members you have the same speed, and if not - revise the cable/other side/patch pannels. Hope this helps :)
... View more
Created by
mateja.jovanovi
in Application Networking
06-01-2015
08:11 AM
06-01-2015
08:11 AM
wow... 2 months and not a single answer... a bit disappointing... The same question I posted on the WireShark forum... there was a bit more luck there, but still confused why Nexus shows the errors in the statistics... https://ask.wireshark.org/questions/40756/how-do-i-make-sure-if-tcp-retransmissions-are-actually-not-fake
... View more
Thanks for the answer Pieterh
in Wireless Security and Network Management
06-01-2015
07:30 AM
06-01-2015
07:30 AM
Thanks for the answer Pieterh, but I don´t really think this is the case, as we have 2 DHCP servers, but in the Active/Standby architecture. Now, regarding your proposal to "wait untill the iPhone decides to send a new request instead of renewal", I'm not sure I get what you mean, How exactly would I configure this? Thanks
... View more
Hi Scott,It happens with all
in Wireless Security and Network Management
05-25-2015
07:44 AM
05-25-2015
07:44 AM
Hi Scott, It happens with all iPhones 5 and 6, regardless of the firmware (haven't tried with iPhone 4 or iPads they are not used in clients corporate network). As users get closer to the elevator zone, while using the WiFi and surfing the internet, a roaming occurs and a request for the authentication (user/password request) suddenly appears. Once they re-authenticate, everything continues normally. Sometimes this happens when switching the AP, sometimes it does not, haven´t been able to figure out a rule.
... View more
04-25-2015
06:18 AM
Nice tool... but for 30 euros I think I´ll stick to the instructions provided by John here below :)
... View more
04-23-2015
03:07 AM
Another Cisco Partner, our direct competition from which we "stole" the client? No... haven't contacted them :)
... View more
04-23-2015
12:12 AM
I wish... here is the answer I got from TAC: " in this case there is nothing we can do to replace it as per Cisco policies and procedures customer has to engage his reseller for support. " So disappointing... Now I need to call the client and tell them they need to throw the lifetime warranty switch away and buy a new one...
... View more
Created by
mateja.jovanovi
in Switching
04-22-2015
05:15 AM
04-22-2015
05:15 AM
A simple question: Our client has 3560X Switches with a limited lifetime warranty. The Cisco Partner with whom they had the contract before bought the equipment, and they did not end up on good terms. One of the devices died the other day. My question is - how do we replace it now? Thanks
... View more
Labels:
Created by
mateja.jovanovi
in Application Centric Infrastructure
04-15-2015
03:58 AM
04-15-2015
03:58 AM
I tried the same thing, but there is no way to run the ACI simulator without the additional HW. You have all the info here: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/simulator/getting-started/b_ACI_Simulator_Getting_Started_Guide.pdf
... View more
Created by
mateja.jovanovi
in Application Networking
03-21-2015
01:00 AM
03-21-2015
01:00 AM
Hi, So we´ve been having this performance issue, and on the capture I can see that maybe 50% of the DC to Core traffic are Out ot Order and TCP Retransmissions. Cisco Nexus device also shows many of these in the Socket Statistics (does someone know how the N5k actually manages to qualify them as retransmissions, how fiable is this?). I do have the same TCP flow going over the same psyical link towards the Checkpoint FW and back to the Core, and then over to the server... but how can I actually be sure if the TCP Retransmissions are not just the members of the same IP flow but detected twice? How does Wireshark detect the Out of order and Retransmission, there is no flag for that, so... some inside intelligence? And even if WireShark is wrong... is Nexus wrong too showing 50% packets as retransmissions in "show socket statistics" output?
... View more
Labels:
12-02-2017
This looks really good, have you maybe tested it with Newton and Unified
Plugin? I'd like to try it ...
Created by
mateja.jovanovic
in Application Centric Infrastructure
06-13-2017
06-13-2017
If you´re doing an upgrade just for the sake of it - I think it might be
better to wait for the 3.0,...
Created by
mateja.jovanovic
in Automation and Analytics
08-24-2016
08-24-2016
Ok, so I had this defined before, and I got a new Mac, and now I cant
remember how exactly I did it....
12-17-2015
You´re the man. Two things to have in mind here: 1. Specify the correct
speed using the "speed" comm...
10-06-2015
Well this is dissapointing... noone anwered in 6 months, and I have the
exactly same problem...
07-16-2015
You probably managed to solve this, or gave up, but when the Port goes
to a SUSPENDED state (s) - th...
06-01-2015
wow... 2 months and not a single answer... a bit disappointing...The
same question I posted on the W...
Created by
mateja.jovanovic
in Wireless Security and Network Management
06-01-2015
06-01-2015
Thanks for the answer Pieterh, but I don´t really think this is the
case, as we have 2 DHCP servers,...
Created by
mateja.jovanovic
in Wireless Security and Network Management
05-25-2015
05-25-2015
Hi Scott,It happens with all iPhones 5 and 6, regardless of the firmware
(haven't tried with iPhone ...
04-25-2015
Nice tool... but for 30 euros I think I´ll stick to the instructions
provided by John here below :)
04-23-2015
Another Cisco Partner, our direct competition from which we "stole" the
client? No... haven't contac...
04-23-2015
I wish... here is the answer I got from TAC: "in this case there is
nothing we can do to replace it ...
04-22-2015
A simple question: Our client has 3560X Switches with a limited lifetime
warranty. The Cisco Partner...
Created by
mateja.jovanovic
in Application Centric Infrastructure
04-15-2015
04-15-2015
I tried the same thing, but there is no way to run the ACI simulator
without the additional HW.You h...
Created by
mateja.jovanovic
in Application Networking
03-21-2015
03-21-2015
Hi,So we´ve been having this performance issue, and on the capture I can
see that maybe 50% of the D...
Public Statistics
| Date Registered | 12-05-2012 12:13 AM |
| Date Last Visited | 11-21-2018 05:11 AM |
| Total Messages Posted | 44 |
| Total Helpful Votes Received | 15 |
Helpful Votes Given To
